How to mine cryptocurrencies?

Hello. He has been interested in cryptocurrencies for some time. I managed to earn quite a lot of money, which I would now like to invest in mining / mining cryptocurrencies. In this regard, I have a few questions. What is the best way to start your adventure with cryptocurrency mining? What crypto is best to mine at this point? What equipment will i need? Let's say I have free electricity, how much can I earn from mining cryptocurrencies?